Rural people often call the pest of local names such as octagonal ding, foreign spicy seed, octagonal seed, etc., in fact, it has a scientific name, belonging to the lepidoptera, stinging moth family, the scientific name is the yellow thorn moth.
The impact of this pest on our childhood is very profound, casually hand or other skin touching the stinger or poisonous hair on its body, it is not a general pain, and the infected area will be red, swollen and inflamed, so when I see it as a child, I avoid it, let alone pick the fruit on the tree.
Symptoms of redness and swelling of the skin caused by yellow stinger poison
Yellow thorn moth is almost distributed in all provinces in China, because it is mainly harmful to apples, pears, hawthorn, peaches, apricots, dates, walnuts, persimmons, citrus and other fruit trees and poplar, elm, tung, moon and other forest trees, so in these fruit trees and forest trees, there will be yellow thorn moths.
And the yellow thorn moth that appears on the fruit tree will not only harm the fruit tree, but also cause serious trouble to our usual pruning, fertilization, spraying, and even fruit picking, so in order to solve the problem caused by the yellow thorn moth, it is necessary to take preventive measures for it so that our fruit trees can grow normally and the fruit farmers can manage normally.
Yellow thorn moth larvae
Before effectively preventing the yellow thorn moth, we need to understand its harmful symptoms, so that we can carry out targeted prevention, mainly explaining the yellow thorn moth on the pear tree.
In general, the yellow thorn moth is a young larvae that nibble on the pulp of pear tree leaves, and after nibbling, the leaves of pear trees are mesh-shaped, as shown in the following figure. When the yellow thorn moth larvae grow up, they once again gnaw the leaves into a blank, leaving only the main veins and petioles of the leaves, looking like a light tree, lifeless.
Yellow thorn moth harms leaf symptoms
Friends who have a little understanding of the planting industry know that whether it is a fruit tree or other crops, the leaves are quite important for the tree body, the leaves are as important as the human heart for the fruit tree, the nutrients of the tree body are all leaf photosynthesis, if the leaves are eaten into light poles, they cannot normally photosynthesis, resulting in very little nutrients in the tree, and eventually affect the tree potential to cause low yield, and the serious one will cause the tree body to die, so the fruit farmer friend should pay enough attention.
The above describes the symptoms of the yellow thorn moth and the importance of the leaves to the tree, and then learn about its morphological characteristics and recall what the pest that had a profound impact on us as a child was like when it was harmed.
First of all, look at the adult insects, the adult body length of the yellow thorn moth is 13 to 16 mm, the inner half of the forewing is yellow, the outer half is yellowish brown, the eggs are flattened oval, pale yellow, 1.5 mm long, mostly on the leaf surface, dozens of egg blocks.
Yellow thorn moth adult
The body of the elderly larvae is 20 to 25 mm long, the body is nearly rectangular, the body has a large purple-brown spot on the back, it is dumbbell-shaped, and there are 4 small brown spots on the back of the terminal segment, and there are two blue longitudinal stripes on each side of the middle of the body. The pupa is oval, hypertrophied, pale yellowish brown, callous calcareous, hard, egg-like, and has several longitudinal stripes of white and brown on the cocoon.
The second is to grasp the life habits of the yellow thorn moth, so that it can be accurately prevented in time through its life habits.
Most of the northeast and north China occur in one generation a year, and Henan, Shaanxi, Sichuan and other provinces can occur in 2 generations a year, with old mature larvae cocooning on branches and branches overwintering.
In areas where two generations occur (such as Sichuan), most pupates begin pupating in early May, adults begin to feather from late May to early June, and larvae occur in July; the next generation of adults begins to feather at the end of July, and the second generation of larvae begins to be pest in early to mid-August. In early September, the larvae overwinter in old and mature cocoons.
Yellow thorn moth cocoon
Well, the next step is to talk about today's focus, how to effectively control the yellow thorn moth, reduce the harm and trouble it brings to us. The control method of the yellow thorn moth can be effectively controlled through 3 types, but the prevention and control in the later stage can only play a role in making up for the lost sheep, and if the prevention work is done well in the early stage, it will have a multiplier effect with half the effort.
1. Artificial hunting combined with pruning in winter and spring, shearing insect cocoons or breaking insect cocoons, and bringing them out of the park for centralized treatment; when young larvae inhabit the pest (the first generation in early to mid-July in Sichuan region, and the second generation in early to mid-August), remove the insect leaves and eliminate the source of insects.
Cut off the cocoon
2, biological control protection and utilization of natural enemies, the natural enemies of the yellow thorn moth are mainly Shanghai green bees, thorn moth broad-shouldered wasps, thorn moth purple bees, ji bees, etc., the use of pest natural enemies to achieve control effects, is undoubtedly the easiest control method.
3, pharmaceutical control When the yellow thorn moth outbreak in a large area, it is necessary to use the agent for timely control, generally in the larval stage, spraying octyl thiophos, borage pine or cypermethrin and other insecticides, can play a timely control effect.
Highly effective cypermethrin in the control of chemicals
The above is today's introduction and control methods of the yellow thorn moth on the pear tree, hoping to help the fruit farmer friends who are troubled by the yellow thorn moth. The leaves of pear trees are the "heart" of the pear tree, and it is everyone's instinct to protect the heart, so protecting the "heart" of the pear tree is also our duty as the owner of the pear tree.
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